In the heartwarming tradition of Old Yeller comes the friendship between a boy and his Tyrannosaurus Rex. When Ely's dog, Tommy, is hit by a car, he goes to his grandpa's house for the summer. While exploring a nearby cave one day, he discovers a full-grown but friendly Tyrannosaurus Rex. As the news of the dinosaur grows, so does the friendship between Ely and his Jurassic pet. But Randy, the mean kid down the street, decides he's going to make life miserable for Ely and his dinosaur - to devastating effect.